Thermococcus, Methanococcus and Methanobacterium are groups of
Bacteria containing a cytoskeleton and all membrane-bound organelles
Archaebacteria with peptidoglycan in their cell wall
Archaebacteria that consists of protein homologous to eukaryotic core histones
Most advanced type of bacteria
C.
Archaebacteria that consists of protein homologous to eukaryotic core histones
Archaebacteria are the most primitive and ancient bacterial species.
Key characteristic features are:
(i) Lack of peptidoglycan in the cell wall instead pseudomurein is present.
(ii) Lipids in cell membrane have a different structure than in all other organisms.
(iii) They lack membrane-bound organelles.
If the free energy change of a reaction is greater than zero, then the reaction is
Spontaneous
Non-spontaneous
At equilibrium
Endothermic
Which of the following sequences represent a possible pathway in the production of a secretory protein?
Rough ER → Secretory vesicle → Ribosome → Golgi apparatus
Ribosome → Rough ER → Golgi apparatus → Secretory vesicle
Secretory vesicle → Golgi apparatus → Ribosomes → Rough ER
Rough ER → Ribosomes → Secretory vesicles → Golgi appratus
Which of the following is the most primitive ancestor of man?
Ramapithecus
Homo habilis
Australopithecus
Homo sapiens neanderthalensis
Independent assortment of gene occurs due to the orientation of chromosomes at
Metaphase-I of mitosis
Metaphase-I of meiosis
Metaphase-II of meiosis
Any phase of the cell division
The mitotic cell cycle is divided typically into four phases; G1, S, G2 and M. Considering a mitotic cycle time of 18 hrs; the distribution of period of time (in hrs) for each of these phases will be
| G1 | S | G2 | M |
| 1 | 3 | 5 | 9 |
| G1 | S | G2 | M |
| 9 | 1 | 3 | 5 |
| G1 | S | G2 | M |
| 9 | 5 | 3 | 1 |
| G1 | S | G2 | M |
| 3 | 5 | 9 | 1 |
The enzyme hexokinase which catalysis glucose to a glucose-6-phosphate in glycolysis is inhibited by glucose-6-phosphate. This is an example of
I. Competitive inhibition
II. non-competitive inhibition
III. feedback allosteric inhibition
Which of the above statements is/are correct?
I and II
I and III
Only III
All of these
Organisms who are able to freely interbreed producing fertile off-springs and having a similar blueprint for making these organisms are referred to as
Species
Tribe
Genus
Sub-genus
The non-disjunction, in meiosis may result is extra copy of a chromosome in a sperm cell. During which phase the above phenomenon may occur?
Prophase-I, prophase-II
Prophase-I, prophase-II
Anaphase-I, anaphase-II
Anaphase-I, telophase-II
